<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div style="background-color: aquamarine">1111</div>
  </body>
  <style>
    div::before::before {
      content: "222";
      width: 20px;
      height: 20px;
      background-color: aqua;
    }
    div::after::after{
      content: "222";
      width: 20px;
      height: 20px;
      background-color: aqua;
    }
  </style>
</html>
